Wave about; flourish (8)
I believe the answer is:
brandish
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">wave about</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">flourish</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that flourish can be written as brandish)</span><br/ ><br/ ></span>
(Other definitions for brandish that I've seen before include "Wave something about threateningly" , "parade" , "Wave, flourish" , "Wave (weapon) aggressively" , "Flourish (a weapon)" .)